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          <h2 class="post-title" itemprop="name headline">媒体查询</h2>
        

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        <p>媒体查询可以让我们根据设备显示器的特性（如视口宽度、屏幕比例、设备方向：横向或纵向）为其设定CSS样式，媒体查询由媒体类型和一个或多个检测媒体特性的条件表达式组成。媒体查询中可用于检测的媒体特性有 width 、 height 和 color （等）。使用媒体查询，可以在不改变页面内容的情况下，为特定的一些输出设备定制显示效果。</p>
<p>常见的媒体查询特性</p>
<p><img src="http://assets.qipo.net/media.jpg" alt></p>
<p>媒体查询的大部分媒体特性都接受min和max用于表达’大于或等于’和’小于或等于’.如:width会有min-width和max-width</p>
<h2 id="媒体查询应用"><a href="#媒体查询应用" class="headerlink" title="媒体查询应用"></a>媒体查询应用</h2><h3 id="兼容移动设备"><a href="#兼容移动设备" class="headerlink" title="兼容移动设备"></a>兼容移动设备</h3><p>需要在html文档中添加以下代码,用来兼容移动设备的显示效果</p>
<figure class="highlight routeros"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;meta <span class="attribute">name</span>=<span class="string">"viewport"</span> <span class="attribute">content</span>=<span class="string">"width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no"</span>/&gt;</span><br></pre></td></tr></table></figure>
<p>参数解释:</p>
<ul>
<li><code>viewport</code>:可视区域</li>
<li><code>width=device-width</code>:宽度等于当前设备的宽度.</li>
<li><code>initial-scale</code>:初始的缩放比例(默认为1)</li>
<li><code>maximum-scale</code>:允许用户缩放到的最大比例(默认为1)</li>
<li><code>user-scalable=no</code>:用户不能手动缩放</li>
</ul>
<h3 id="添加媒体查询样式"><a href="#添加媒体查询样式" class="headerlink" title="添加媒体查询样式"></a>添加媒体查询样式</h3><h4 id="检测屏宽"><a href="#检测屏宽" class="headerlink" title="检测屏宽"></a>检测屏宽</h4><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE html&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>媒体查询<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--</span></span><br><span class="line"><span class="comment">    移动设备有关viewport</span></span><br><span class="line"><span class="comment">    visual viewport</span></span><br><span class="line"><span class="comment">    idea viewport</span></span><br><span class="line"><span class="comment">    layout viewport</span></span><br><span class="line"><span class="comment">    --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">name</span>=<span class="string">"viewport"</span></span></span><br><span class="line"><span class="tag">    <span class="attr">content</span>=<span class="string">"width=device-width,initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no"</span> &gt;</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="name">style</span>&gt;</span><span class="undefined"></span></span><br><span class="line"><span class="undefined">      * &#123;</span></span><br><span class="line"><span class="undefined">        margin: 0;</span></span><br><span class="line"><span class="undefined">        padding: 0;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.one</span> &#123;</span></span><br><span class="line"><span class="undefined">        font-size: 50px;</span></span><br><span class="line"><span class="undefined">        color: red;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">      /*</span></span><br><span class="line"><span class="undefined">      根据当前屏幕的特点，当符合其中某个规则时，就会应用对应的样式</span></span><br><span class="line"><span class="undefined">      */</span></span><br><span class="line"><span class="css">      <span class="comment">/*根据可视窗口 宽度*/</span></span></span><br><span class="line"><span class="css">      @<span class="keyword">media</span> screen and 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class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="css">      <span class="selector-class">.two</span> &#123;</span></span><br><span class="line"><span class="undefined">        color: purple;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">      /*</span></span><br><span class="line"><span class="undefined">      当尺寸大于等于 980px， min-width下限</span></span><br><span class="line"><span class="undefined">      */</span></span><br><span class="line"><span class="css">      @<span class="keyword">media</span> all and (min-width: <span class="number">980px</span>)&#123;</span></span><br><span class="line"><span class="css">          <span class="selector-class">.two</span> &#123;</span></span><br><span class="line"><span class="undefined">            color: orange;</span></span><br><span class="line"><span class="undefined">            font-size: 100px;</span></span><br><span class="line"><span class="undefined">          &#125;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">      /*</span></span><br><span class="line"><span class="undefined">      当尺寸小于等于 1200px， max-width上限</span></span><br><span class="line"><span class="undefined">      */</span></span><br><span class="line"><span class="css">      @<span class="keyword">media</span> all and (max-width: <span class="number">1200px</span>)&#123;</span></span><br><span class="line"><span class="css">          <span class="selector-class">.two</span> &#123;</span></span><br><span class="line"><span class="undefined">            background: yellow;</span></span><br><span class="line"><span class="undefined">          &#125;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="css">      <span class="selector-class">.three</span> &#123;</span></span><br><span class="line"><span class="undefined">        font-size: 100px;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">      /*</span></span><br><span class="line"><span class="undefined">      and是并且</span></span><br><span class="line"><span class="undefined">      */</span></span><br><span class="line"><span class="css">      @<span class="keyword">media</span> all and (min-width: <span class="number">600px</span>) and (max-width:<span class="number">980px</span>)&#123;</span></span><br><span class="line"><span class="css">        <span class="selector-class">.three</span> &#123;</span></span><br><span class="line"><span class="undefined">          color: green;</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="css">      @<span class="keyword">media</span> all and (min-width: <span class="number">981px</span>) and (max-width:<span class="number">1200px</span>)&#123;</span></span><br><span class="line"><span class="css">        <span class="selector-class">.three</span> &#123;</span></span><br><span class="line"><span class="undefined">          color: yellow;</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="css">      @<span class="keyword">media</span> all and (min-width: <span class="number">1201px</span>) and (max-width:<span class="number">1920px</span>)&#123;</span></span><br><span class="line"><span class="css">        <span class="selector-class">.three</span> &#123;</span></span><br><span class="line"><span class="undefined">          color: blue;</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">    </span><span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">"one"</span>&gt;</span></span><br><span class="line">      开始是红色的</span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">"two"</span>&gt;</span></span><br><span class="line">      two元素</span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">"three"</span>&gt;</span></span><br><span class="line">      three元素</span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h4 id="检测横屏-竖屏"><a href="#检测横屏-竖屏" class="headerlink" title="检测横屏 竖屏"></a>检测横屏 竖屏</h4><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE html&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>media<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">name</span>=<span class="string">"viewport"</span></span></span><br><span class="line"><span class="tag">    <span class="attr">content</span>=<span class="string">"width=device-width,initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no"</span> &gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="name">style</span> <span class="attr">media</span>=<span class="string">"screen"</span>&gt;</span><span class="undefined"></span></span><br><span class="line"><span class="undefined">      * &#123;</span></span><br><span class="line"><span class="undefined">        margin: 0;</span></span><br><span class="line"><span class="undefined">        padding: 0;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="css">      <span class="selector-class">.one</span> &#123;</span></span><br><span class="line"><span class="undefined">        font-size: 100px;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="css">      <span class="selector-class">.one</span><span class="selector-pseudo">::before</span> &#123;</span></span><br><span class="line"><span class="undefined">        content: "等待检测。。。。";</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">      /*</span></span><br><span class="line"><span class="undefined">      检测屏幕</span></span><br><span class="line"><span class="undefined">      */</span></span><br><span class="line"><span class="css">      @<span class="keyword">media</span> screen and (orientation: portrait)&#123;</span></span><br><span class="line"><span class="css">        <span class="selector-class">.one</span><span class="selector-pseudo">::before</span> &#123;</span></span><br><span class="line"><span class="css">          <span class="selector-tag">content</span><span class="selector-pseudo">:"</span>竖屏。。。";</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="css">      @<span class="keyword">media</span> screen and (orientation: landscape)&#123;</span></span><br><span class="line"><span class="css">        <span class="selector-class">.one</span><span class="selector-pseudo">::before</span> &#123;</span></span><br><span class="line"><span class="css">          <span class="selector-tag">content</span><span class="selector-pseudo">:"</span>横屏。。。";</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined">    </span><span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span 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